<!DOCTYPE html>
<html>
<head>
<style type="text/css">
div {
 height: 20px;
}
.fieldset {
 background-color: green;
}
</style>
</head>
<body>
<div class="fieldset"></div>
<div></div>
<div class="fieldset"></div>
<div></div>
<div class="fieldset"></div>
</body>
</html>
